GPRS Cell Options (SI13): Add REL-4 CCN_ACTIVE bit

This is required in order to tell MS that osmo-pcu now supports
Network Assisted Cell Change (NACC).

Related: SYS#4909
Change-Id: I2aaa8c1107c977f711c2d7530034f57e36e3a237
diff --git a/include/osmocom/gprs/protocol/gsm_04_60.h b/include/osmocom/gprs/protocol/gsm_04_60.h
index 05728f4..ed63fe0 100644
--- a/include/osmocom/gprs/protocol/gsm_04_60.h
+++ b/include/osmocom/gprs/protocol/gsm_04_60.h
@@ -167,7 +167,7 @@
 	GPRS_NMO_III	= 2,	/* no paging coordination */
 };
 
-/* TS 04.60 12.24 */
+/* TS 44.060 12.24 */
 struct osmo_gprs_cell_options {
 	enum osmo_gprs_nmo nmo;
 	/* T3168: wait for packet uplink assignment message */
@@ -187,6 +187,7 @@
 		uint8_t pfc_supported;
 		uint8_t dtm_supported;
 		uint8_t bss_paging_coordination;
+		bool ccn_active;
 	} ext_info;
 };